Fan



A. C. GOUGH.

FAN.

APPLICATION FILED ocT.2I. 1921.

Patents@ @et 317, 11922- @Hoz nyc LM Patented @et i7, i922.

unrTeo sTaTas ACHJELLES COLLOWAY GO'UGH, @IF PCATELLG, EDAHO.

FAN.

Application led october 21, 1921. Serial No. 509,404.

T o` a-ZZ whom t may concern.'

Be it known that l, AcHrLLEs C. GroUoH, a citizen of the United States, residing at Pocatello, in the county of Bannock and State of Idaho, have invented certain new and useful Improvements in Fans; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

IThis invention relates to an improvement in fan structure and more particularly to fans for use in connection with automobile engines for cooling the same. rl`he object ofthe present invention is to provide a fan\which will operate-similarly to those now in common use to create a movement of air through the radiator and to direct the draft of cooling air over the exterior of the engine casing and which will at the same time operate to divert, propel and cleanse from impurities such as dust and grit, a portion of air and supply the same for use in the carburetor or interior of the engine casing where desired.

The invention consists in the novel construction, arrangement and combination of parts hereinafter more p-articularly described and claimed.l

One sheet of drawings accompanies this specification, as part thereof, in which like reference characters indicate similar parts throughout. t

Fig. 1 is a fragmentary side elevation of an automobile engine showing my improved fan in position;

Fig. 2 is a plan view fan;

Fig. 3 is a transverse sectional view taken on the line 3-3 of Fig. 2;

Fig. 4 is a diagrammaticillustration of a method for laying out my improved fan.

In accordance with my present invention, li5-fan blades 1 are made hollow, each having one face 4c inclined atan angle with the axis of rotation of the fan and provided with a plurality of radially extending slits 5, lips 6 adjacent each of said slits 5 being 50 set at an angle so as to present faces oposed to the direction of rotation of the of my improved an, as illustrated in Fig. 3, the direction of rotation being indicated in that Figure by the arrow Y.

rlhe front edge 7 of each blade may be made straight but'the back edge 8 of each blade is made to conform toa .modified involute curve extending from a substantially large radius adjacent the front edge 7, as at Q, and concluded at a relatively short radius adjacent the front edge Tof the opposite fan, as at 10. By this structure7 it w1ll be apparent that the back edge 8 of each blade will operate with a cam like e'ect upon all air entering the fan blade through the slits 5 directing said air generally as indicated by the arrow Z (Fig. 2) toward the center of the fan 11'."

The fan is mounted upon a hollow shaft 12 which` is provided with suitable orifices (not shown) communicating with the interior of the fan blades so that air directed toward the center of the fan willbe forced through hollow shaftlQ which ma he connected by a suitable tube 2 to a eater B and thence through suitable tubes 3 3 to the carburetor C and the breather l).

ln operation it will be apparent that upon rotation the fan thus directed will blow a cooling blast upon the engine A, while at the same time a certain amountof air will be forced in through the openings 5 and propelled by the cam surfaces 8 through the hollow shaft 12, as indicatedl. 'llheaii thus taken'into the fan structure will be cleaned through the operation of the deflect-T ing lips 6 which will operate toeXpel `any particles. of gritor dust coming m contact therewith.

rlhe curve for the back-.of the fan blades may be easily computed as for an involute curve with slight modifications at each end to make the curve smooth in connection with the opposing blade. Referring to 4:, the curve 8 is laid oit' so that the ang e X. between the perpendicular to any'particular radius and the tangent to the curve intersecting said radius at that point, increases gradually and the least possible amount as the radius R decreases. In general any curve drawn to proportionally diminishing radii will, it is believed, prove ,eectiva at least to some degree.

Modifications in the exact vcurve and the precise arrangement and construction of the parts will readily suggest themselves to those skilled in the art, but within the scope of the present-invention.

Having thus described my invention, I claim: f

l. A fan having hollow blades, the rear faces of said blades curved from a maximum radius adjacent the front edge of the blade toa minimum radius adjacent the front edge of an adjoining blade, the advancin'g faces of said blades being provided With a plurality of radially extend-ing slits. 2. An improved fan having hollow blades set at an inclination to the: axis of rotation, means for admitting air into said blades through the advancing faces thereof, the back Walls of said blades being curved to provide a cam like. surface to force the air received into said blades toward the center of the fan.

3. In an air cleaning and propelling device, a hollow blade having an advancing face set at an inclination to the axis of rotation, means in said advancing face to admit air to the interior of said blade, the back Wall of said blade conforming toa substantially involute curve, as and for the purposes specied.

In testimony whereof I aHiX my signature.

ACHILLES COLLOWAY GOUGH. 

